#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
       
int main(int argc, char *argv[]) 
{  
  int fd = open("error", O_WRONLY|O_CREAT|O_APPEND, 0644);
  dup2(fd, 2); close(fd);
  printf("hello on stdout\n");
  fprintf(stderr, "hello on stderr\n");  
  return EXIT_SUCCESS;
}